entity_id,source_id,evidence_type,source_note ENT_WEL_GWYN_AP_NUDD,SRC_GREEN_CELTIC_GODS,scholarly attestation,Green (1992) pp. 104-105: Gwyn ap Nudd as the psychopomp fairy-king and Wild Hunt leader in Welsh tradition; his role as controller of the demons of Annwn; connection to the Otherworld sovereignty traditions ENT_WEL_GWYN_AP_NUDD,SRC_MABINOGION,direct attestation,Culhwch ac Olwen: Arthur must recruit Gwyn ap Nudd for the hunt of Twrch Trwyth because only Gwyn can control the demonic boar; Gwyn is described as holding the power of the demons of Annwn lest they destroy the present world; he fights Gwythyr every May Day for Creiddylad; primary Mabinogion attestation